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2. Ram Air Progression System - Wikipedia

   en.wikipedia.org/wiki/Ram_Air_Progression_System

   This jump will be the first time a student experiences the full transition from falling vertically to falling "belly-to-earth". Typically a student must perform two stable delays of 10 seconds before progressing. 15/20-second delays – gradually increasing freefall time (10 to 20 seconds) so the student can demonstrate stability for longer ...

3. Boeing X-20 Dyna-Soar - Wikipedia

   en.wikipedia.org/wiki/Boeing_X-20_Dyna-Soar

   Boeing mock-up of X-20 Dyna-Soar. Days after the launch of Sputnik 1 on 4 October 1957, on either October 10 [18] or October 24, [19] the USAF Air Research and Development Command (ARDC) consolidated Hywards, Brass Bell, and Robo studies into the Dyna-Soar project, or Weapons System 464L, with a three-step abbreviated development plan.

4. Free logic - Wikipedia

   en.wikipedia.org/wiki/Free_logic

   A free logic is a logic with fewer existential presuppositions than classical logic. Free logics may allow for terms that do not denote any object.

5. List of valid argument forms - Wikipedia

   en.wikipedia.org/wiki/List_of_valid_argument_forms

   Another form of argument is known as modus tollens (commonly abbreviated MT). In this form, you start with the same first premise as with modus ponens. However, the second part of the premise is denied, leading to the conclusion that the first part of the premise should be denied as well.

6. Why your phone doesn’t make for the best alarm clock - AOL

   www.aol.com/one-small-thing-help-sleep-130059433...

   “When you didn’t get enough sleep or didn’t get good quality sleep, the likelihood that an extra 5 to 10 minutes of sleep could make a meaningful impact is pretty low,” Dr. Joseph ...

7. Snowboarder killed in Colorado avalanche as reports of deadly ...

   www.aol.com/snowmobile-rider-killed-colorado...

   DENVER – Officials say a snowboarder was caught, buried and killed in an avalanche west of Denver on Saturday. According to the Colorado Avalanche Information Center (CAIC), the avalanche ...